ASTM F955-2007 Standard Test Method for Evaluating Heat Transfer through Materials for Protective Clothing Upon Contact with Molten Substances《通过接触带熔态物质的防护衣材料评估热传递的标准试验方法》.pdf
《ASTM F955-2007 Standard Test Method for Evaluating Heat Transfer through Materials for Protective Clothing Upon Contact with Molten Substances《通过接触带熔态物质的防护衣材料评估热传递的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM F955-2007 Standard Test Method for Evaluating Heat Transfer through Materials for Protective Clothing Upon Contact with Molten Substances《通过接触带熔态物质的防护衣材料评估热传递的标准试验方法》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: F 955 07Standard Test Method forEvaluating Heat Transfer through Materials for ProtectiveClothing Upon Contact with Molten Substances1This standard is issued under the fixed designation F 955; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the evaluation of materialsthermal resistance to molten su
3、bstance pour by describingmeans of measuring heat transfer.NOTE 1As used in this test method, the term molten substance refersto the three compositions (aluminum, brass, and iron) for which theprocedure was validated. The test design may be adapted for use withother substances not validated as part
4、of the test method.1.2 This test method is applicable to materials from whichfinished protective apparel articles are made.1.3 This test method does not measure the flammability ofmaterials, nor is it intended for use in evaluating materialsexposed to any other thermal exposure exclusive of the molt
5、ensubstance itself (see Note 1).1.4 This test method should be used to measure and describethe properties of materials, products, or assemblies in responseto molten substance pour under controlled laboratory condi-tions and should not be used to describe or appraise the thermalhazard or fire risk of
6、 materials, products, or assemblies underactual conditions. However, results of this test may be used aselements of a thermal risk assessment which takes into accountall the factors that are pertinent to an assessment of the thermalhazard of a particular end use.1.5 This standard does not purport to
7、 address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. Specific hazardstatements are given in Section 8.2.
8、 Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesE 457 Test Method for Measuring Heat-Transfer Rate Usinga Thermal Capacitance (Slug) CalorimeterF 1494 Terminology Relating to Protective Clothing3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 brea
9、k-openin testing thermal protective material, aresponse evidenced by the formation of a hole in the materialwhich allows the molten substance to pass through the mate-rial.3.1.2 charringthe formation of carbonaceous residue asthe result of pyrolysis or incomplete combustion.3.1.3 drippinga material
10、response evidenced by flowingof the polymer.3.1.4 embrittlementthe formation of a brittle residue asthe result of pyrolysis or incomplete combustion.3.1.5 heat fluxthe thermal intensity indicated by theamount of energy transmitted divided by area and time,W/m2(cal/cm2s).3.1.6 human tissue burn toler
11、ance (heat tolerance)in thetesting of thermal protective materials, the amount of thermalenergy predicted to cause a second-degree burn injury inhuman tissue.3.1.7 ignitionthe initiation of combustion.3.1.8 meltinga material response evidenced by softeningof the polymer.3.1.9 response to molten subs
12、tance pourin testing thermalprotective material, the observed effect of molten substancecontact on textile properties or deterioration of the material.3.1.10 shrinkagea decrease in one or more dimensions ofan object or material.3.1.11 thermal end pointin the testing of thermal protec-tive materials,
13、 the point where the copper slug calorimetersensor response (heat energy measured) intersects with apredicted skin burn injury model.3.2 For definitions of other textile terms used in this testmethod, refer to Terminology D 123.4. Summary of Test Method4.1 Amaterial specimen is mounted on a vertical
14、 incline andis exposed to a molten substance pour of prescribed minimumtemperature, volume, pour rate, and vertical height.1This test method is under the jurisdiction ofASTM Committee F23 on PersonalProtective Clothing and Equipment and is the direct responsibility of SubcommitteeF23.80 on Flame and
15、 Thermal.Current edition approved Feb. 1, 2007. Published February 2007. Originallyapproved in 1985. Last previous edition approved in 2003 as F 955 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMSta
16、ndards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 The amount of heat energy that is transmitted throughthe test specimen during and after th
17、e molten substanceexposure is measured using two copper slug calorimeters. Theheat transport response is assessed versus the Stoll curve, anapproximate human tissue tolerance predictive model thatprojects the onset of a second-degree skin burn injury asmanifested by a blister (See 12.2).4.3 A specif
18、ic set of subjective evaluations is performed onthe test specimen response to the molten substance exposureusing a standardized rating scale for appraisal (found in TableX.1).5. Significance and Use5.1 Workers may be exposed to contact with molten sub-stances. The clothing used should provide some p
19、rotection.Whether personal injury results from such contact depends onthe resistance of the material from which the clothing is madeto molten substance contact and the amount of heat transferredthrough the material to the wearer.5.2 This test method rates materials, that are intended forprotective c
20、lothing against potential molten substance contact,for their thermal insulating properties and their reaction to thetest exposure.5.3 The protective performance, as determined by this testmethod, will relate to the actual end-use performance only tothe degree that the end-use exposure is identical t
21、o theexposure used in the test method.5.4 Visual inspection of the specimen subjectively notes thematerials resistance to molten substance contact.6. Apparatus6.1 The test apparatus consists of four major components asfollows:6.1.1 An inclined specimen mounting and exposure boardwith two copper slug
22、 calorimeter thermal sensors and supports,6.1.2 A pouring crucible and pouring mechanism,6.1.3 A furnace for melting the test metal, and6.1.4 Instruments for measuring test conditions and testresults.6.2 Sensor Construction6.2.1 Each copper slug calorimeter shall be 18 6 1g,40mm diameter and 1.6 mm
23、thick and shall be constructed fromelectrical grade copper with a single 30 gage, iron/constantanthermocouple wire and shall be installed as identified in Fig. 1.6.2.2 The exposed surface of each copper slug calorimetershall be painted with a thin coating of a flat black hightemperature spray paint
24、with an emissivity of 0.9. The paintedsensor shall be dried before use and present a uniformlyapplied coating (no visual thick spots or surface irregularities).Note that an external heat source, for example, an external heatlamp, has been used to completely drive off any remainingorganic carriers on
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